Shaky life of a water drop in an anise oil-rich environment

This paper is associated with a video winner of a 2018 APS/DFD Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2018.GFM.V0054

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Figure 1

(a)–(c) Evolution of a water droplet (dyed blue for contrast) upon being deposited in a 5:1 (volume) anethole:ethanol solution. Time after deposition: (a) 33 s, (b) 63 s, and (c) 69 s. (d) Several water droplets 8 s after deposition in a 2:1 anethole:ethanol mixture. https://doi.org/10.1103/APS.DFD.2018.GFM.V0054

Figure 2

(a) A drop in a 5:1 solution, 2 s before detachment. The yellow line is the best-fitting hydrostatic solution obtained by adjusting the value of the Bond number, which is $\text{Bo}=2.53$ in this case. (b) Time history of droplet volume for two experimental realizations in a 6:1 anethole:ethanol solution. In each case, the first two detachment events are shown. It becomes apparent that the mixing process is much slower after the pinch-off event.